Purity of Blood

Illyana Carmen (OC) is just beginning her education at Hogwarts. After a childhood of isolation, will she do as she's told and keep her head down or break all the rules to help her new friends fight the evil she's been hiding from her entire life? "We all have masks we have to wear, Illy. We all have a part to play. This is yours, and I need you to play it flawlessly." AU-CANONDIV